Research on disturbance properties of suspensions near the injection area of moving jet     

Lin Jian-zhong  Zhou Ze-xuan  Wu Tao  You Zhen-jiang 《浙江大学学报(A卷英文版)》2001,2(1):15-23

The equation of the suspension-gas non-streamwise complex disturbance velocity ratio near the injection area of moving jet was theoretically derived by using a phase-coupled model and stability theory. Then the ratio curves were obtained by the finite difference method based on the asymptotic method and the Euler conservative difference scheme. Analysis of the curves yielded conclusions on the disturbance properties of suspensions and effects of the natures of the flow-field and the properties of the suspensions on the suspensions ability to track the disturbed gas flow are presented in this paper. Projects supported by the State Education Commussion’s Trans-century Training Program Fund for Talents  相似文献   

夜光遥感在“一带一路”战略中的应用潜力展望     

江威  何国金  彭燕  王桂周  王猛猛 《中国科学院大学学报》2017,34(3):296-303

面向“一带一路”战略对沿线国家空间认知的现实需求，阐述该战略的地理科学内涵。结合对地观测的优势和特点，总结“一带一路”对地观测应用领域。回顾夜光遥感在对地观测中的独特优势，指出夜光遥感在油气开采时空信息挖掘、社会经济参数估算、生态环境评估、城市化过程重建等领域具有应用潜力。认为夜光遥感在服务“一带一路”战略中具有独特作用，契合该战略的地理科学内涵和对地观测科学要素，可为“一带一路”战略的实施提供重要的空间信息支持。  相似文献   

大学生健康就业心理培育的差异化策略     

秦艺妮 《高校辅导员学刊》2012,(1):44-47

大学生健康就业心理的培育必须针对不同阶段、不同群体的就业心理问题运用差异化的培育策略。大一新生应着重进行就业认知培养,大二学生应强调就业素质的自我完善,大三学生应引导走近职业世界,大四学生应引导摆正就业心态等。男生应着力培养创业精神,女生应重点引导发掘女性自身的职业优势。  相似文献   

The Effectiveness of Collaborative Augmented Reality in Gross Anatomy Teaching: A Quantitative and Qualitative Pilot Study     

Felix Bork  Alexander Lehner  Ulrich Eck  Nassir Navab  Jens Waschke  Daniela Kugelmann 《Anatomical sciences education》2021,14(5):590-604

In the context of gross anatomy education, novel augmented reality (AR) systems have the potential to serve as complementary pedagogical tools and facilitate interactive, student-centered learning. However, there is a lack of AR systems that enable multiple students to engage in collaborative, team-based learning environments. This article presents the results of a pilot study in which first-year medical students (n = 16) had the opportunity to work with such a collaborative AR system during a full-day gross anatomy seminar. Student performance in an anatomy knowledge test, conducted after an extensive group learning session, increased significantly compared to a pre-test in both the experimental group working with the collaborative AR system (P < 0.01) and in the control group working with traditional anatomy atlases and three-dimensional (3D) models (P < 0.01). However, no significant differences were found between the test results of both groups. While the experienced mental effort during the collaborative learning session was considered rather high (5.13 ± 2.45 on a seven-point Likert scale), both qualitative and quantitative feedback during a survey as well as the results of a System Usability Scale (SUS) questionnaire (80.00 ± 13.90) outlined the potential of the collaborative AR system for increasing students' 3D understanding of topographic anatomy and its advantages over comparable AR systems for single-user experiences. Overall, these outcomes show that collaborative AR systems such as the one evaluated within this work stimulate interactive, student-centered learning in teams and have the potential to become an integral part of a modern, multi-modal anatomy curriculum.  相似文献   

The influence of children's prior knowledge and previous experience on their spatial orientation skills in an urban environment     

Ingrid Hemmer  Michael Hemmer  Eva Neidhardt  Gabriele Obermaier  Katja Wrenger 《Education 3-13》2013,41(2):184-196

This study investigates the capacity of children to develop map-based skills in spatial orientation in an urban environment unknown to them. In this quantitative study, a total of 328 pupils of grades 3–5 had to achieve specific skills with regard to map-based skills in spatial orientation (such as turning-off skills, transformation from map to place, finding one's direction, navigation). These skills were tested by means of a map of Münster (Westphalia, Germany). This paper focuses on factors of potential influence, such as prior knowledge in the field of map reading as well as family- and school-related previous experience.  相似文献   

HOMEless: a case study of private/public inversion and the temporal–spatial exclusion faced by migrant domestic workers     

Young‐Ie Wuo 《Inter-Asia Cultural Studies》2013,14(3):325-354

Abstract

This paper is a case study of the shutdown of HOME (the House for Migrant Workers' Empowerment), a cultural and service center for migrant workers. HOME was founded by the Taipei City Labor Bureau (TCLB) and subcontracted to TIWA (the Taiwan International Workers' Association) in 2002, when the Director of the TCLB was the former labor activist Zheng Cun‐qi. For migrant domestic workers, the distinction between sold‐time and free‐time (i.e. the work–rest distinction) is blurred. Most of their supposedly private reproductive activities are temporally squeezed into holidays and spatially forced into public places where they are exposed to the scrutiny of the Taiwanese. This peculiar situation of private/public inversion not only results from, but also serves to reinforce, racial discrimination and class inferiority in their workplace (i.e. the homes of their employers). I use the concept of ‘bracketing’ to describe the spatial‐temporal strategies used by migrant domestic workers against this distorted inversion. I also analyze how employers ‘counter‐bracket’ migrant worker subjects as a counter strategy. HOME once existed as a ‘surrogate home’, providing shelter for migrant workers and allowing them to retain privacy during their days off. TIWA conducted organizing‐oriented cultural and political activities to assist the migrants in forming their own community, and challenged the spatial hegemony of real estate owners in the ChungShan District. However, when Yan Shang‐luan, a well‐known feminist labor research professor, took over the directorship of the TCLB in 2004 Taipei City Labor Bureau. 2004. “‘Minutes of the meeting for the analysis, review, and evaluation of administrative efficiency at the House for Migrant Workers' Empowerment’ ‘’”. 26 August [Google Scholar], she did not appreciate the function of HOME, and decided to close its doors. In analyzing the official rhetoric in the documents of the TCLB, I find that their decision to shut down HOME was a result of their middle‐class temporal‐spatial ‘habitus’. The shutdown became a counter‐bracket measure, which coincided with the real estate interests of the ChungShan local elites.  相似文献   

港口物流信息平台共享架构及其可视化挖掘   总被引：3，自引：0，他引：3  

舒帆 《上海海事大学学报》2006,(Z1)

从港口物流信息的特点入手,提出基于控制理论的信息流程图,并围绕流程图中的信息输入与输出反馈两大部分提出港口物流信息平台建设的关键问题;结合港口物流信息平台实例,重点讨论共享架构的执行现状、意义和技术路线,并按照信息的类型,分别讨论针对空间信息和属性信息的可视化数据挖掘技术手段,从而保证信息平台在共享架构下实现可靠高效的数据管理与控制．  相似文献   

基于 ArcEngine 的空间数据入库系统的设计与实现     

王佩  吕志勇  杜福光 《唐山师范学院学报》2012,(2):59-63

空间数据入库是 GIS 系统建设的重要环节之一,对海量空间数据如何统一管理是空间数据库建设的核心问题.采用基于 ArcEngine 组件二次开发方式,以 ArcSDE 为“桥梁”进行空间数据入库,总结了空间数据入库的具体流程、系统设计等关键问题,并根据实际项目需求,对系统进行了具体实现,对各类 GIS 工程、项目中空间数据入库具有广泛的指导意义.  相似文献   

河南省居民出游力空间分异及影响因素分析     

薛宝琪  范红艳 《昆明大学学报》2012,4(1):55-60

运用因子分析与聚类分析法对河南居民出游力空间分异及影响因素进行了探索性研究。结果表明：河南居民出游力可划分为极强、强、较强、弱和极弱五种类型。全省居民出游力以郑州为中心向四周逐渐减弱,呈现出＂西高东低,北高南低,中部突出＂的特征。郑州是全省居民出游力的极点区域,四大经济区居民出游力由强到弱排序为中原城市群、豫北经济区、豫西豫西南经济区、黄淮经济区,与其经济发展水平高低排序相吻合。经济能力、信息沟通、交通运输是影响河南居民出游力空间分异的主要因素。  相似文献   

同义词recommend和propose的搭配行为异同辨析     

钟珊辉 《湖南第一师范学报》2012,(5):91-95

reconmend和propose在意义上很接近,传统语法一般认为二词可替换使用,对语义和语境未做必要的探讨。通过对语料库中的实例分析,recommend和propose的互为替代并没有像传统语法说的那样轻松,其语域方面、类联接方面、搭配意义方面以及与宾语搭配时所呈现出的选择限制方面都存在异同,且差异的形成是有潜在的语义支撑的。从深层次的语义语用含义来对同义词进行辨析,能使我们更恰当地使用词语。  相似文献